Pulverizer



' inane-as.

ernaartoe.

PAUL S. KNITTEL, F

COMPANY, or

ST. LOUIS, MISSOURI, ASSIGNOR TO AMERICAN ST. LOUIS,MISSOURI, ACORPORATION OF 'MISSOURL PULVERIZER PULVERIZER.

Application led .'l'anuary of the pulverizer in close proximity to theFig. 1;

ig. 3 is a plan bars showing the grate -bars tioned so as to obtain thenarrow spacing;

the drawing,

hammers carried by the rotor.

The principal object ofthe present 1n- 'vention is to make prov1sion"forvarying the spacing of grate bars.

rlhe invention consists in a grate bar having spacing lugs projectingfrom its opposite sides so arranged that when a series of such bars areplaced side'by side in one position, `one spacing. is obtained and whenone of such bars is turnedend for end a di'erent spacing is obtained;and it further conslsts in the arrangements and combinations of partshereinafter described and claimed.

In the' accompanying drawings, wherein like symbols refer to Ylike partswherever they occur,

Fig. 1 is a vertical cross-section taken through the lower portion of apulverizer showing a number of grate bars embodying my inventionarranged thereinE the bars being shown in cross-section on the line 1-1in` Fig. 2; A

Fig. 2 is a longitudinal section taken through the pulverizer on theline 2-2 in view of a number of grate arranged with their lugs oppositeeach other to obtain the wide spacing;v

Fig. 4 is a plan view of the bars so posiand Fig. 5 is a view similer toFig. 4 showing a modified form of grate bar.v

My invention is shown in connection with a pulverizer. y As shownin'Figs. 1 and` 2 of the sid@l walls ofthe lower casing 5 of thepulveri'zer are each provided with an inwardly projecting arcuateange 6upon which the grate bars 7 are supported to form an arcuate grate; rlhegrate bars are substatntially T-shape in cross-section and comprise astem portion 8 whose thick- Y Specification of Letters Patent.

bars intended'for use in connectlon Patenten aug. s, i922.

2, 1919. serial No. 269,328.

ness increases from the bottom towards the top, tion. The stem portion 8of the bar diminishes in depth from the middle toward each end, and thebars are provided with bearing ends 10, which rest on the arcuateflanges 6 of the side walls of the lower casing 5.

Each of the grate bars is provided with spacing lugs 11 on its oppositesides, which are flush with'the upper surface of the head portion 9 ofthe bar and have wide fiat faces. v.The lugs on one side of the bar arelocated at equal distances from the middle part or mid-line of the bar,and the lugs on the other side of the bar are also loeatedat equaldistances from the mid-line, but are oifset longitudinally of the barfrom its middle towards each end with. respect to the lugs on theopposite side. With the bars arranged side by side in the same position,(as shown in Fig. 4) the bars are spaced apart the thickness of thelugs,l the oifsetting of the` lugs causing the lugs on one bar to clearthose on the other. On the other hand, when one of the bars is turnedend for end with respect to its neighbor (asshown in Fig. 3) the wideflat faces of their lugs abut against each other and thus the spacing ofthe bars is the sum of the thiclmesses of the meeting `lugs. Theopposite sides of the lower portion of the stem 8 of the bars areprovided with lugs 12 which are disposed directly below the lugs 11 atthe middle portion of the bar. rlhese lugs 12 space the lower portionsof the bars which have a tendency to tilt when the bars reach a'positionon either side of the arcuate supporting flange 6 of the -side walls ofthe lower .casing 5. When the bars are arranged in a horizontal line, aswhen they are used in connection with furnaces, these lugs 12 may' beeliminated.

By placing the bars in the position shown in Fig. 3 with the lugs of theadjacent bars registering, the wide spacing ,can be .obtained. Byturningv alternate bars end for end and placing them'in theposition/shown in Fig. 4, `with the lugs of one bar bearing p againstthe body portion of the adjacent bar, the narrow spacing shown can beobtained. .With a set of bars of the kind described having lugsprojecting the same distance from the sides, two different widths ofspacing can be obtained, but it isoblvious that vwith sets of barswherein the several bars and a head portion 9 of rectangular secsaidbars registering,

i is obtained and, when i registerfand a different Width"` of spacing ff said l opposite sides Idisposed in said `midvvay ybeing.offsetlongitudinally ofthey bar with respect tof the lugs `on lthe`vopposite side yof along side of a similar having spacing lugs whichproject different distances from their sides, various Widths of yspacingcan be obtained. v v i Asshovvn in Fig. 5, twovwidths of sp-acing canalso be obtained with twosets or styles of grate 4bars eliminated andbar B having the -cent to the left of the center line eliminated. ThesetWo types of bar are .necessary to obtain the Wide spacing, but toobtain the narrovv spacing, oneor the other or both types of bar may beused.

The hereinbefore described baris self-k spacing, can be `quicklyplacedin position and When Worn or vdamaged can be easily replaced. Due to theShape of the head portion 9l at the top of said bar the life 'of saidbar is longer than the bar of the type heretoforeused. fThe head portion9 of the bar is rectangular in cross-section `and there tojwear at thecorners, Which tore le'ss `apt are right angles, than the barsoftheordinary-type which is V-shaped incrosssectionA and has sharpangles at its'upper corners.'

- WhatIclaini'is: i

l. A pulverizer having an arcuate grate comprising separate vgratebars,l each gratte bar consisting of a vertical'stemportionv portion` atthe' .top thereof,

having a head I gratebarl having spacing lugs yon its provided with fiat'end faces,

' some of the lugs on one yside'bf "thebar being disposed lin pairs atequal distances from `a 35i line midwayfoi the length' of the bar,y andsome of the lugs on the other side lalso being pairs at equal idistances from point and the lugs onfone side said bar, Wh'erebywhensaid bar'is placed bar lW'ithfthe lugs of one Width". of spacing saidbar is'vturned end said barsare out lof for end the lugs of i isobtained 2. -A fpulverizer having" anl arcuate lgrate comprisingseparate grate bars, eachgrate 50 bar consisting of a verticalstemvportion having' airectangular head, said'grate bar having-bearingportions at its opposite ends,

vone side of -saidbar havingbearing lugs at f each end and a lugon eachside "of its middle -part/ spaced equidistant therefrom, 'the otherlsidevof-s'aid bar havinga lug located A and B, bar A having the` lugadjacent to the right of the center liney lug adjaand offset yinwardlyfrom `bar4 with respect to the lugs` on said register* `one Qvvidth of'tained l and. with" every ,der 0f December, 1918- at its middle part andhaving a'lug near veach end spaced equidistant from said midf dle partand `offset inwardlyfrom each end yofthe bar Withvrespect to the end lugon havingav head portion of substantially `rec-y tangular section, saidgrate bar'having bearing portions'at its opposite ends, one yside ofsaid grate bar havingspacing'lugsat each end and a spacing lug at thetop and'bottom "each -side of the `and spaced equiof saidside located onmiddlefpart of the bar distant therefrom, ythe otherv side of said barhaving lugs at the top and lbottom thereof located'at the middle "artofthe bar and having a lug neareadi distant from the middle each end ofthe rst mentioned side.

`LA vpulveriZer having ,an arcuateA gratey g'comprislng separate gratebars, each grate barhaving'*spacing lugs on opposite sidesoiset'longitudinally of` the bar, the lugs on one'vsi'de beingso'positioned as to b e outv of end spaced equiy of Said barregister'w'vith thelugs of a similar bar alongsaid bar when it is turnedendiforjend with its ends flush with the ends of the' otherbar.

5. Av pulver'izerhaving an arcuate grate ycomprising a series'of I y'-s'ideb'yv side, eachof saidgrate barsfhaving spacingflugs'; `on bothsides',"the lugs lon one side of 'said barlbeing'ol'se't longitudinallygrate bars arranged of the bar from its middle towards, each end Withrespect'to thelugs on the opposite side 'with the bars placed of saidbai-,whereby side by side in the same position, their lugs spacing isoby other one of :said bars turned Iend for end, the lugs ofadj acentbars are out of registerand a different width o'f-'spac-ing'isobtained.y 'p l :Signed-"at St. Louis, Missouri, this 28th f PAUL vs..KNITTEL.

" side thereof and yinregister:with thelugs ofv

